31 Jan
2011
31 Jan
'11
3:35 p.m.
On 31/01/11 20:43, Steven Hirsch wrote:
Indeed!
Hitting 100MHz timing rate was another nice milestone. The next one is
to decouple the pulse-timer clock and the memory controller clock, which
means I'll be able to push the thing a little bit faster. From memory,
the Fmax for the timing counter is about 133MHz.
Although, to be honest, I like having a 100MHz acq clock. The 10ns steps
make it really easy to interpret the timing graphs -- count of 100, one
microsecond. Simples!
The
log-histogram shows a very distinctive MFM timing pattern (three
peaks at 1T, 1.5T and 2T), and the scatter-graph shows that the timing
data is split into 17 distinctive segments: the sectors.
Very kewl.. A serious milestone is reached! If the PS has problems with the MPI drive, wait until
you attach a real
manly drive like a Priam V185 or Maxtor 2790 :-). Those beasts just
about dim the room lights with the inrush!
It doesn't have problems with the MPI drive, it has problems when you
run the MPI drive and a 3.5in floppy at the same time :)
As I said, that's an impossible combination -- without some form of
multiplexer, you can't have both wired to the controller port at the
same time.
--
Phil.
classiccmp at philpem.me.uk
http://www.philpem.me.uk/